/Engine/Source/Runtime/SlateCore/Public/Layout/BasicLayoutWidgetSlot.h
Padding will be deprecated soon. Use SetPadding or construct a new slot with FSlotArguments.
MixedIntoType & Padding ( [TAttribute](API\Runtime\Core\Misc\TAttribute)< [FMargin](API\Runtime\SlateCore\Layout\FMargin) > InPadding )